Date: Wed, 29 Jan 1997 09:07:02 +1100 (EST) From: "Daniel O'Callaghan" <danny@panda.hilink.com.au> To: pumpkin@uk.pi.net Cc: FreeBSD ISP list <freebsd-isp@freebsd.org> Subject: Re: Multiple IP addresse, hostnames on one machine Message-ID: <Pine.BSF.3.91.970129090111.13981o-100000@panda.hilink.com.au> In-Reply-To: <Pine.BSI.3.95.970128105423.314C-100000@Zero-Cool.Hades.Org>
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On Tue, 28 Jan 1997 pumpkin@uk.pi.net wrote: > On Tue, 28 Jan 1997, Daniel O'Callaghan wrote: > > > [......] > > Note that a CNAME record *must* point to an A record, not to another CNAME. > > > Why not? It works for me: > > (zone file) > Zero-Cool IN A 10.10.10.1 > WWW IN CNAME Zero-Cool > test IN CNAME www > > (scot@Zero-Cool) ~ >nslookup test > Server: localhost.Hades.Org > Address: 127.0.0.1 > > Name: Zero-Cool.Hades.Org > Address: 10.10.10.1 > Aliases: test.Hades.Org, www.Hades.Org > > It seems to resolve OK doesn't it? With a double lookup. What a waste of bandwidth. Q whois test? A test=WWW Q whois WWW? A WWW=Zero-Cool, IP=10.10.10.1 Another common misconfiguration is pointing an MX at a CNAME, e.g. hades.org. IN MX 10 test.hades.org. (Generates error "hades.org has CNAME and other data"). > > 1. The aliased address is part of the same subnet/network as the primary > > address. > > > > In this case, you need to specify a netmask of 0xffffffff (8 f's) and put > > I've heard of this before... but I can't find anyone who can tell > me why the netmask has to be different. Personally I don't specify > a netmask for the aliases and it seems to work out OK. Any offers? What version of FreeBSD are you running? In the later versions, the netmask 0xffffffff is required. I think it might be to do with preventing broadcasts multiple times on each interface, but perhaps the person who made it like that can comment. Dannyhome | help
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